Author： McTague John P. Bailey Robert L.
Publisher： Society of American Foresters
ISSN： 0015-749X
Source： Forest Science, Vol.31, Iss.4, 1985-12, pp. : 899-911
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Abstract
Critical height sampling as a technique for estimating stand volume without using volume tables is explained. Based on point sampling for tree selection, the stand volume estimator is the product of the point sampling basal area factor and the sum of critical heights of trees in the sample. The critical height of a tree is the height to a point on the bole where stem diameter exactly subtends the horizontal sighting angle from a vertical line originating at the sample point. The estimator is shown to be unbiased when either of two published tree taper models is assumed. Variances of the ongrowth and nongrowth components of the volume growth estimator are shown to be less than the variances of these components in the compatible estimator for growth when a random spatial distribution of trees is assumed. Forest Sci. 31:899-911.
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